When selecting an edge or vertex with "Occlude Background Geometry" enabled, Blender will select a different vertex or edge disconnected from the one I intend to select. It is consistent with certain vertexes in that it will select the same 'other' vertex every time from any camera angle, almost as if they are connected. This also occurs in border select (b) and 'circle select' (b twice).

I've had no problems with wireframe mode, nor when "Occlude Background Geometry" is disabled. When in face select mode a standard select (right click) works, however a 'circle select' (b twice) will exhibit the same problem.

I can reproduce the problem with any model, from the default cube to a complex, subsurfaced face model. The included screenshot is after clicking on the center vertex on top of the cube using the 'circle select' (b twice) tool (you can still see the tool). The cube has been subdivided twice to enhance the problem. Obviously, the two faces on the bottom left should not be selected.

From Blender:

Blender Version: 2.45-16 "Gamera" | Win32 Dynamic
Python Version: 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit (Intel)]
Open GL:
- Renderer: 256MB ATI Radeon X1300PRO x86/SSE2
- Vendor: ATI Technologies Inc.
- Version: 2.0.5885 WinXP Release
OS: XP Service Pack 2